The following pages provide an detailed overview of the recalculations carried out against the previous submission, focussing on changes in emission estimates reported for 1990 (1995 for emissions of PM2.5 an PM10) and the last year reported within the previous submission (here: 2010).

Generally, improvement of the emission inventory is an ongoing task and triggers recalculations for all source categories and pollutants frequently.

Further informations regarding recalculations (especially due to changes in methods or activity data) can be found in the corresponding chapter of the National Inventory Report.

Reasons for Recalculations

Due to the ever ongoing efforts to improve the inventory, more or less broad recalculations become necessary with each new submission.

Possible reasons for recalculations are:

new (sub-)categories to be included in the inventory or dislocation of subcatagories within the inventory

data (activity data & emission factors) for certain (sub-)categories available for the first time

change of data sources (for activity data)

use of new emission factors (due to: inquest, research projects, expert judgement etc.)

improvement of methods used for calculating emissions

outcome of ongoing review activities under both UNFCCC and UNECE

etc.

All these changes can effect both several years of the inventory or the whole time series back to 1990 (PM: 1995), leading to more or less significant changes within the emission trends.

Declaration of Recalculations

Under UN FCCC reporting, parties have to comment any recalculations in any year leading to differences between latest and current submission for a given year or the time period. Thereby, highest attention is given to recalculations within base year and the most current year of the latest submission:

Recalculations in base year data:

mostly rather small but of highest importance

mostly due to changed methods or emission factors used for entire time series

impact on the amount of emission reduction reported in latest submission

Recalculations under UN ECE

Within this IIR, Germany will focus on recalculations within 1990 (PM: 1995) and the most current year of the latest submission, giving a) the quantity (in absolute numbers and in %) of change for any recalculated emission and b) the reasons for the recalculations done.